Method and arrangement for transferring telephone conversations to other electrical devices



B. LOEWE Jan. 6, 1942.

2,268,665 SATIONS METHOD AND ARRANGEMENT FOR TBANSFERRING TELEPHONE CONVER TO OTHER ELECTRICAL DEVICES Filed March 25, 1939 Patented Jan. 6; 1942 I 2,268,665 I Q METHOD AND ARRANGEMENT FOR TRANS- v FERRING TELEPHONE CONVERSATIONS 'TO OTHER' ELECTRICAL DEVICES I Bernhard Loewe, Yonkers, N. Y.

Application March- 25, 1939, Serial No. 264,083

1 Claim .(01. 179-1) My invention relates to a method of .transferring telephone-conversations and the like toelectrical devices which are in no way directly connected with the telephone-circuit. More particularly my invention is concerned withiarrangements for the practical use of the said method.

I have found that there is a considerable dispersed field outside of regular telephone-receiv 7 ers in their neighbourhood. The density of this field is not even all around the receiver. often it'culminates on certain points of the front side of the receiver befor the membrane but sometimes it is stronger 'on the back side or at a side. It depends upon of what construction the receiver is. On putting one or more suitable formed coils in this field. there will be induced Very . put of the latter being connected with the speaker considerable tensions in the coils which latter may be provided with. an iron core.

The principal object of my invention is the use of this electrical field for transferring telephoneconversations to other electrical devices such as' other receivers or amplifiers for reproduction by a loudspeaker or by recording or-for transferring the said conversations to interoilice-communicae tion circuits, etc. By using this newmethod acinput for phono-pickup of a regular radio set. The coils may be cording to my invention no conducting junction has "to be made between the telephone-circuit andthe coil-circuit, thus avoiding any disturbance and reaction in the telephone-circuit which otherwise may occur.

Another object of my invention is to provide simple inegrpensive and efficient arrangements for. picking-up the dispersed field as described above. a

Other objects and advantages of the invention will become apparent from the following description taken in connection with the accompanying drawing in which:

Figure 1 a schematic circuit diagram according to the invention, a e V Figure 2 a front view of an arrangement according to the invention after removing the cover from the middle part, b

Figure 3a sectional view across the same arrangement as shown in Figure 2 taken in the direction A-B, the arrangement being attached to a receiver-part of a so-calledFrench-telephone, the receiver .partly shown vin sectional view, e V

Figure 4 a side view of another arrangement constructed according to the invention,

Figure 5 a view to the back sideof still another arrangement according to the invention attached to the back side a single earphone-receiver.

Figure 6 a side view of the same arrangement as shown in'Figure 5;

Referring to Figure 1 which diagrammatically illustrates one form of circuit according .to the invention, a receiver I whichis connected with an ordinary telephone-circuit by the wires 2 is placed opposite a pair of coils 3 in such a position, that tnefield starting from inside the receiver. may

induce electrical tensions in. the coils 3. The.

coils are connected to each other in such a way that the tensions are added and the other ends 01' the windings of the coils are connected by the wires '4 with the input of an amplifier 5, the outby the wires 6. Any'suitable' amplifier and loudspeaker may be used and very good results are obtainedby connecting-the wires 4 with the provided with an iron core and the whole arrangement may be turnable aroundthe axis. X-X for adjusting the coils in the most eflicient position opposite th coils of there I ceiver. The number of wire-windings and the resistance of the coil is largely variable and should be adapted to the connected circuit. 7 7 15.000 to 20,000 windings and a D. C. resistance of 2000 ohms are suitable for most of the pur-. poses.

In Figure 2 is shownan arrangement of two coils I2 and I3 put over an iron core of U-shape ll andconnected to each other by the wire Ma. The other ends of the coils are connected with the inner conductor l4 andthe shielding H of a shielded cord I5. The coils are fastened for instance by an insulating wax in a suitable formed cavityof' the holder 8. The use of this holder may be best'illustratedby Figure 3 which is a cross-section of Figure 2 along the line A'B, and

Y which shows how the holder .8 fitsxover the resembling thewhole arrangemen ceiver-part l6 of aso-called French-telephone.

The holder 8 which may be made out of elastic and insulating material such as rubber but may as well partly or on the whole .consistofother material fits with his part 4| over the front-part 42 of the receiver l6. The holder 8 may be attached to the receiver in'such'a position that the is provided with holes'9'so thatthe sound starting from the membrane 20 may pass through the holder 8, so. any regular telephone-conversation can be made even after attaching the arrangement to the telephone-receiver. i0 is a cover for th cavity which is brought in place after as- 'REISSUED eck? 9 2' I b axis of the receiver-coils l8 and I9 coincide with the axis of the coils l2 and I3. -The.holder"8 furthermore bears a cylindrical arrangement 21 which contains the coils as above described, the

terminals for connecting the said coils with the circuit being ill and 3|. The cylindrical'arrangement 2! flts in a sliced ring 28 so that it may be adjusted by turning and then fixed by pressing the slicedends of the ring together by means of the screw 29. The weight of the telephone 22 presses the lever against the movable pin 25 which then will be moved downwards. This movement can be used for switching on acircuit attached by the cord 18 or for similar purposes. After removing the telephone from the hook a spring presses the pin 25 and the lever upwards and releases the pressure from the switch.

- In Figure 5 is shown the back side of an earphone 33 to which an arrangement 34 is attached by means of the elastic clasps 35, 36 and 31. The cylindrical part 38 contains the coils. The ends accepts and with the conductors of a shielded cord :0

in the usual manner. 44 is cord connecting the earphone 33 with the' telephone-circuit.

It will be understood that various modifications within the conception of those skilled in the art are possible without departing from the spirit of my invention or the scope of the claim.

I- claim-as my invention:

Coupling device for inductive coupling of a telephone-circuit with another circuit, comprising two series connected coils mounted on an U- shaped iron core, with the free ends of the coils connected preferably to a shielded cord, and with the core and the coils mounted thereon covered with nonconducting material and tightly sealed in a suitably formed cavity of a holder, the latter being made of elastic, non-conducting material and of such a shape, thatits inner part its over the earpiece of a telephone rece'iver, holding hereby the core and the coils thereon in proper position to the corresponding parts of the telephone receiver, the outer part of the holder having the shape of an earpiece, and the wall beof their windings are connected to each other tween the inner and the outer part of the holder having holes. 1

BERNHARD LOEWE. 

